This plugin will fix word `Comments` to go with Central European languages when comments count is between 2 and 4.
<?php comments_popup_link_2_4('No comments', '1 Comment', '% Comments', '% Comments(when 2-4)'); ?>where you have popup links and
<?php comments_number_2_4('No comments', '1 Comment', '% Comments', '% Comments(when 2-4)'); ?>where you are displaying number of comments in your template and translate the strings into your language. For the count between 2 and 4 there is the last string. Remember that functions have added _2_4 at the end of its name.